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I'm a well-known mainframe performance guy, with almost 30 years of experience helping customers manage systems. I also dabble in lots of other technology. I've sought to widen the Performance role, incorporating aspects of infrastructural architecture.
I'm a world-famous podcaster and screencaster (albeit VERY thinly spread). :-)

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As you probably know Hardware Data Compression has been supported by MVS
and IBM mainframes for around 20 years. In several recent batch studies
I've conducted it's been evident in a widespread way. (In
this post I'm not talking about DB2 compression of either flavour or
VSAM compression - though some of the information here applies to these
functions as well.) It's not as
simple... [More]

I've written extensively in the past about what you can glean about batch suites from SMF, most notably SMF Type 30. While I don't believe SMF alone can give you the full dependency network (complete with validation) I've just added some analysis to my code that gets me a little closer. As you're probably never going to run my code the bit that would be interesting is the kind of inferences it's... [More]